SSA-541018

Vulnerability from csaf_siemens - Published: 2021-03-09 00:00 - Updated: 2022-03-08 00:00
Summary
SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2)

Notes

Summary
Security researchers discovered and disclosed 33 vulnerabilities in several open-source TCP/IP stacks for embedded devices, also known as "AMNESIA:33" vulnerabilities. This advisory describes the impact of two of these vulnerabilities (CVE-2020-13987, CVE-2020-17437) to Siemens products. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not available. The impact of another "AMNESIA:33" vulnerability (CVE-2020-13988) is described in Siemens Security Advisory SSA-541017.
General Recommendations
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
Additional Resources
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use
Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.
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{
  "document": {
    "acknowledgments": [
      {
        "organization": "Cybersecurity and Infrastructure Security Agency (CISA)",
        "summary": "coordination efforts"
      },
      {
        "organization": "CERT Coordination Center (CERT/CC)",
        "summary": "coordination efforts"
      },
      {
        "names": [
          "Daniel dos Santos",
          "Jos Wetzels",
          "Amine Amri"
        ],
        "organization": "Forescout Technologies",
        "summary": "coordinated disclosure"
      }
    ],
    "category": "Siemens Security Advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
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    "notes": [
      {
        "category": "summary",
        "text": "Security researchers discovered and disclosed 33 vulnerabilities in several open-source TCP/IP stacks for embedded devices, also known as \"AMNESIA:33\" vulnerabilities.\n\nThis advisory describes the impact of two of these vulnerabilities (CVE-2020-13987, CVE-2020-17437) to Siemens products.\n\nSiemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not available.\n\nThe impact of another \"AMNESIA:33\" vulnerability (CVE-2020-13988) is described in Siemens Security Advisory SSA-541017.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens\u0027 operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\n\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
        "title": "General Recommendations"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens\u0027 underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter \"License Terms\"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens\u0027 Global Website (https://www.siemens.com/terms_of_use, hereinafter \"Terms of Use\"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.",
        "title": "Terms of Use"
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    "references": [
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        "summary": "SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2) - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf"
      },
      {
        "category": "self",
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        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-541018.txt"
      },
      {
        "category": "self",
        "summary": "SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2) - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-541018.json"
      }
    ],
    "title": "SSA-541018: Embedded TCP/IP Stack Vulnerabilities (AMNESIA:33) in SENTRON PAC / 3VA Devices (Part 2)",
    "tracking": {
      "current_release_date": "2022-03-08T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-541018",
      "initial_release_date": "2021-03-09T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-03-09T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2021-05-11T00:00:00Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added download link of update version for SENTRON PAC3220"
        },
        {
          "date": "2021-08-10T00:00:00Z",
          "legacy_version": "1.2",
          "number": "3",
          "summary": "Added solution for SENTRON 3VA COM100/800 and DSP800"
        },
        {
          "date": "2021-10-12T00:00:00Z",
          "legacy_version": "1.3",
          "number": "4",
          "summary": "Added solution for PAC3200T"
        },
        {
          "date": "2022-02-08T00:00:00Z",
          "legacy_version": "1.4",
          "number": "5",
          "summary": "Added solution for SENTRON PAC2200 (with and without MID approval)"
        },
        {
          "date": "2022-03-08T00:00:00Z",
          "legacy_version": "1.5",
          "number": "6",
          "summary": "Added download link of update version for SENTRON PAC2200"
        }
      ],
      "status": "final",
      "version": "6"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V4.4.1",
                "product": {
                  "name": "SENTRON 3VA COM100/800",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON 3VA COM100/800"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V4.0",
                "product": {
                  "name": "SENTRON 3VA DSP800",
                  "product_id": "2"
                }
              }
            ],
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            "name": "SENTRON 3VA DSP800"
          },
          {
            "branches": [
              {
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                "name": "vers:all/*",
                "product": {
                  "name": "SENTRON PAC2200 (with CLP Approval)",
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                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (with CLP Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V3.2.2",
                "product": {
                  "name": "SENTRON PAC2200 (with MID Approval)",
                  "product_id": "4"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (with MID Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V3.2.2",
                "product": {
                  "name": "SENTRON PAC2200 (without MID Approval)",
                  "product_id": "5"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC2200 (without MID Approval)"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V2.4.7",
                "product": {
                  "name": "SENTRON PAC3200",
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                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3200"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V3.2.2",
                "product": {
                  "name": "SENTRON PAC3200T",
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                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3200T"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V3.2.0",
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                  "name": "SENTRON PAC3220",
                  "product_id": "8"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC3220"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V2.3.0",
                "product": {
                  "name": "SENTRON PAC4200",
                  "product_id": "9"
                }
              }
            ],
            "category": "product_name",
            "name": "SENTRON PAC4200"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-13987",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The TCP/IP stack (uIP) in affected devices is vulnerable to out-of-bounds read when calculating the checksum for IP packets. (FSCT-2020-0009)\n\nAn attacker located in the same network could trigger a Denial-of-Service condition on the device by sending a specially crafted IP packet.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "6",
          "9"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-13987 - SENTRON 3VA COM100/800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "summary": "CVE-2020-13987 - SENTRON PAC3200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "summary": "CVE-2020-13987 - SENTRON PAC4200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "summary": "CVE-2020-13987 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-13987.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V4.4.1 or later version",
          "product_ids": [
            "1"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.4.7 or later version",
          "product_ids": [
            "6"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.3.0 or later version",
          "product_ids": [
            "9"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "category": "mitigation",
          "details": "For successful exploitation, an attacking system must be located in the same Modbus TCP segment as a vulnerable device. Therefore ensure that only trusted systems are attached to that segment and only trusted persons have access.",
          "product_ids": [
            "1",
            "6",
            "9"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "6",
            "9"
          ]
        }
      ],
      "title": "CVE-2020-13987"
    },
    {
      "cve": "CVE-2020-17437",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The TCP/IP stack (uIP) in affected devices is vulnerable to out-of-bounds write when processing TCP packets with urgent pointer (URG) where the location of the TCP data payload is calculated improperly. (FSCT-2020-0018)\n\nAn attacker located in the same network could trigger a Denial-of-Service condition on the device by sending a specially crafted IP packet.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-17437 - SENTRON 3VA COM100/800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON 3VA DSP800",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109799046/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC2200 (without MID Approval)",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109760897/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC3200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC3200T",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793060/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC3220",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109780938/"
        },
        {
          "summary": "CVE-2020-17437 - SENTRON PAC4200",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "summary": "CVE-2020-17437 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-17437.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V4.4.1 or later version",
          "product_ids": [
            "1"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109765343/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V4.0 or later version",
          "product_ids": [
            "2"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109799046/"
        },
        {
          "category": "no_fix_planned",
          "details": "Currently no remediation is planned",
          "product_ids": [
            "3"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "MID-certified devices do not support firmware updates; V3.2.2 is contained in devices that are labeled as \"M22 MID\"",
          "product_ids": [
            "4"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.2.2 or later version",
          "product_ids": [
            "5"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109760897/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.4.7 or later version",
          "product_ids": [
            "6"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/31674577/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.2.2 or later version",
          "product_ids": [
            "7"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793060/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V3.2.0 or later version",
          "product_ids": [
            "8"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109780938/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V2.3.0 or later version",
          "product_ids": [
            "9"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/35029840/"
        },
        {
          "category": "mitigation",
          "details": "For successful exploitation, an attacking system must be located in the same Modbus TCP segment as a vulnerable device. Therefore ensure that only trusted systems are attached to that segment and only trusted persons have access.",
          "product_ids": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9"
          ]
        }
      ],
      "title": "CVE-2020-17437"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.